Feed-regulator for sewing-machines.



P. DIEHL & H. EIOHHORNI FEED REGULATOR FOR SEWING MACHINES. APPLICATION FILED D3012, 1912.

1,118,271 Patented Nov. 24, 1914.

UNITED STATES PATENT OFFICE.

PHIILIP DIEHL AND HERMANN EICHHORN,

or ELIZABETH, NEW JERSEY, assrenons TO THE SINGER MANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

FEED-REGULATOR FOB. SEWING-MACHINES.

Speeificatidn of Letters Patent.

Patented Nov. 24, 1914.

Application filed December 12, 1912. Serial No, 736,247.

To all whom it may concern:

Be it known that we, PHILIP DIEHL and HERMANN EICHHORN, citizens of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, .have invented certain new and useful Improvements in Feed-Regulators for Sewing-Machines, of which the following is a specification, reference being bad there n to the accompanying drawings.

This invention 'has for its object to provide the feeding mechanism of a sew ng machine with controlling or regulat ng means whereby the normal work-advancing movements of the mechanisnrmay be reversed to'produce a retrograde movement of the work equal or proportionate to its normal rate of advancing movement.

As embodied in the regular four-motion feeding mechanism of a Singer sewing machine, the link-bar connected with the feed rock-shaft, and deriving its vibratorymovements from a cam upon the main-shaft, is provided intermediate its ends with a fulcrum connected with a swinging link whose fulcrum is sustained by and eccentrically to the feed-regulator rock-shaft which extends through the wall of the bracket-arm and has upon its outer end an operating lever-'for turning it. The feed-regulator rock-shaft has also fixed thereon a stop-member extending across and in both directions from its axis of movement and adapted for engagement upon either side of said axis with the point of a stop-screw also journaled in the bracket-arm. The head of the stop-screw exterior to the bracket-arm is formed with an annular series of closely spaced notches adapted to be entered by similarly. spaced projections formed upon the adjacent face of a cap adjustably secured thereon. The saidcap is provided with a series of peripheral notches adapted to be entered by the conical end of a spring-pressed detent-pin journaled in the bracket-arm and adapted to arrest the circular movement of the stop screw in different positions of the latter for determining its operative relation with the stop-member of the feed-regulating rockshaft. The cap is provided with a stop-pin adapted for en agement with the said spring pressed etent-pin to prevent the turning of the stop-screw through more than a complete rotation, so that the position of the stop-screw corresponding with a certain length of stitch will .be correctly shown by means of an indicating device including a properly graduated circular scale upon or adjacent and concentric with the cap.

In the accompanyin drawings, Figure 1 is inside elevation of t e rearward end of a sewing machine embodyin the present improvements, with the brac et-arm and bedplate in section, and Fig. 2 is a transverse section of the same looking forwardly. Fig,

{3 is an enlarged perspective view represent- 111g the feed-regulating device, and Fig: 4

a similar View showing the feed-regulating rock-shaft with its stop-member and the stop-screw cooperatmg therewith. Figs. 5

and 6 are perspective views showingjrespectively the cap and the stop-screw to which the cap is applied.

' As represented in the drawings, the sewmg machine frame comprises the bed-plate 1 from which rises the hollow standard 2 with tubular lateral arm 3 in which is journaled the main-shaft 4 carrying the feedlift crank 5 and the feed-actuating ca and provided with the usual balance-wheel 7- with grooved belt-wheelS.

- Embracing the feed-actuatin cam 6 is the yoke 9 formed at the upper on of the linkbar 10 which extends downwardly through the hollow standard 2 of the bracket-arm and is pivotally connected by means of the screw -stud 11 with the crank-arm 12 upon which has. at its forward end the usual upwardly extendingarms 14 carrying pivotal screw-pins 15 by means of which 1t is connected with the feed-bar 16, upon which is secured the usual feed-dog 17. The opposite the rearward end of the feed rock-shaft 13 end of the feed-bar 16 is formed with theusual fork 18 embracing the roller-stud 19 carried b the lateral arm 20 of the feed-lift rock-sha 21 provided upon its rearward end with the lateral:=crank-'arm 22 pivotally connected by means of the'screw-pin 23 with the lower end of the rod 24 which is formed at its opposite end with the strap 25 embracing the feed-lift crank 5.

Secured in position by of the link-bar 10 slightlybelow its yoke 6 means'of the clamp-nut 26 within thezapertured boss 27.

apertured boss 29 at one end of the supporting link 30 whose opposite end is similarly provided with an apertured boss 31 embracing the stud-pin 32 sustained by a crankarm 33 which is fixed upon the feed-regulator rock-shaft 34. The feed-regulator rock-shaft is journaled within the bearing boss 35 of and extends through the wall of the standard 2, having secured upon its outer end by means of the set-screw 36 and locking screw 37 the hub 38 of the operating lever 39.

As represented inthe drawings, the crankarm 33 is provided with the threaded aperture 33 to receive the similarly threaded stud-pin 32 disposed eccentrically to the feed regulator rock-shaft, and has formed integral therewith the plate or disk 40 having the angularly disposed edges 41 and 42 arranged transversely to and upon opposite sides of the axis oi the rock-shaft'34. The plate 40 const tutes a sto -member whose operative shoulders 41 an 42 are adapted for engagement with the rounded inner end por tion 43 of the stop-screw 44 which is journaled within a suitably threaded aperture in the bearing boss 45 of the standard 2 transverse to the rockshaft 34.

The enlarged outer portion or head 46 of the stop-screw is shown provided in its outer face with the annular groove 47 between which and its periphery it is provided with a series of radial nicks or serrations 48, and within which it is provided. with a threaded socket 49. Secured to the head 46 of the stop-screw by means of the fastening screw 50 is the cup-shaped cap 51 formed with knurled peripheryand having upon its inner face surrounding thescrew-aperture 52 the annular series of radial projections 53.

corresponding in spacing with the nicks 48 of the head 46 and adapted to enter the same when the, cap is secured in position thereon. By this means, the cap 51 may be applied to the stop-screw head 46 in the re uired position thereon, in which it is 100 ed by the interengaging projections 53 and nicks 48 with the parts clamped in position by means of the screw 50. I

The cap 5.1 has in its inner edge a series of notches 54 adapted to be entered by the conical point of a detent-pin 55 slidingly fitted within a suitable socket in the bearing lug 45 and having its reduced inner portion '56 surrounded by a spring 57 interposed between the head of the pin 55 and the bottom of the surrounding socket, whereby the spring is normally pressed outwardly into yielding engagement with the inner edge of the cap 51. Between the notches 54 at one side the cap is provided with a stop-pin 58 which is adapted to contact with the opposite sides of the detent-pin 55 when the cap is turned into opposite extreme positions so that it is limited to slightly less than a comthe stop-member 40 for the initial length of plete rotation in its control of the position of the stop-screw relatively to the stop member 40..

The stop-screw cap is shown in the drawings provided in its outer face with a circular scale graduated to correspond with the spacing apart of the detent-notches 54. The dial thus produced is provided with figures to indicate the number of centimeters of the stitch-lengths corresponding with the ex- 7 treme throw of the feedregulator rockshaft 34 when either stop-shoulder 41 or 42 is in contact with 'the-stop-screw in its indicated position. By means of the circular adjustment of the cap 51 upon the head of the stop-screw,.the cap may be secured in position with its dial and stop-pin properly located after the screw has been turned into a corresponding initial position relatively to feed, and the construction is therefore adapted to correct in this respect any lack of unformity in the lengths of the screws or positions of the operative shoulders 41 and 42 of the stop-member in manufacturing such devices in large quantities. As the feed-length adjustment is formed upon a normally stationary part, and that part has indicating means for showing the length of stitches corresponding with its various positions, it is evident that the length of the stitches may be adjusted by merely turning the stop-screw to the desired position, the

voperating lever 39 being only then required to be thrown from one to the other of its extreme positions limited by the stop-screw. to cause the feed to impart advance or retrograde movements to -the work correspondingly.

Having thus set forth the nature of the invention, what we claim herein is 1. ln a sewing machine, the combination with the frame comprising a bed-plate and a bracket-arm formed with a hollow standa rd and an overhanging tubular member extending laterally therefrom, a. rotary shaft journaled in said tubular member and carrying a feedactuatin'g element, a feed rockshaft arranged below the bed-plate and operatively connected with a feeding element, a crank-arm upon said rock-shaft, a linkbar pivotally connected at one end with said crank-arm and extending upwardly through said standard and operatively connected at its opposite end With the, feedactuating element, and a laterally movable fulcrum for said link-bar, of a rock-shaft for sustaining said fulcrum journaled in and extending through the wall of said standard and provided with a stop member extendingoppositely across its axis of movement, an operating lever secured upon the fulcrum-sustaining rock-shaft exterior to said standard, and a stop-screw journaled in and extending through the wall of said standard transversely to the fulcrum-sustaining rock-shaft and adapted for engagement with said stop member upon either side of its axis of movement.

2. In a sewing machine, the combination with the frame, including a hollow standard, of feeding mechanism, a feed regulating device comprising a rock-shaft, a lever applied to said rock-shaft, a stop-member sustained by said rock-shaft and extending oppositely across the latters axis of movement, a stop-screw journaled in a fixed bearing and adapted for engagement with said stop-member upon either side of its axis of movement, said screw being provided with a cap having an annular series of notches, a socket formed in said standard, an endwise movable detent pin fitted within said socket, and a spring supported by said standard and adapted to press said pin into engagement with the notches of said cap.

3. In a sewing machine, the combination with feeding mechanism, of a feed-regulating device comprising a rock-shaft, a lever applied thereto for turning it, a stop-member sustained by said rock-shaft and extending oppositely across the latters "axis of movement, a. stop-screw journaled in a fixed bearing and adapted for engagement with said stop-member upon either side of its axis of movement, yieldingly operating detaining means applied to said screw and acting at predetermined intervals in a rotary movement thereof, and means for preventing the turning of said stop screw through more than a complete rotation.

4. 1n a sewing machine, the combination with feeding mechanism, ofa feed-regulat-I 'lng device comprising a rock-shaft, a lever applied thereto for turning it, a stop-member sustained by said rock-shaft and ex tending oppositely across the latters axis of movement, astop-screw journaled in a fixed bearing and adapted for engagement with said stop-member upon either side of its axis of movement, yieldingly operating detaining means applied tosaid screw and acting atpredeterminedintervals in a rotary movement thereof, and means adapted for operative engagement with an element of said detaining means for reventing the turning of said stop-screw hrough more than a complete rotation.

5. In a sewing machine, the combination with feeding mechanism, of a feed-regulating device comprising a rocking stop-member, a stop-screw mounted in fixed bearings and adapted for engagement with said stopmember upon either side of its axis of motion, said screw being formed with a head having an annular series of notches, a cap applied tosaid head and formed in its adjacent face with projections adapted to enter said notches in the screw-head, means for removably securing said cap to the screw-head, and detaining means operating yieldingly to restrain the rotation of said stop-screw at predetermined points, and including a non-rotating d'etent member.and an annular series of cooperating elements carried by said cap.

6. In a sewing machine, the combination with a standard, of feeding mechanism, a

feed regulating device comprising a rockshaft projecting within said standard and operatively connected with vsaid feeding mechanism, an operating lever secured upon vsaid rock-shaft exterior to said standard,

a stop-device comprising interengaging members mounted respectively upon said rock shaft and the standard, one of said members being in the form of a stop-screw movable toward and from the axis of move-.

PHILIP DIEHL. HERMANN EICHHORN.

Witnesses:

HENRY J. MILLER, HENRY A. KORNEMANN. 

